These 10 facts about space will blow your mind. A correspondence course is an academic class that is taken â and taught â across some geographical distance. The original correspondence courses were carried out through the postal service. Professors would mail assignments and lecture notes to students, who would return essays and projects for grading.
A voluntary muscle, often called a skeletal muscle, is one of three types of muscle in the body. Most voluntary muscles are used to move bones, though some, such as the muscles in the face, are used to create movements below the skin. Unlike cardiac or smooth muscle, these muscles can be controlled by the conscious mind.
These are also called voluntary muscles.. Smooth muscle is involuntary, and is not under conscious control; the muscles in your digestive system are smooth muscles. The cells are individual and are found in sheets instead of long fibers.here skeletal muscle is voluntary, cardiac muscle is autorhythmic (beats involuntarily; generates its own action potentials). 3. Smooth muscle: refers to the muscles that are controlled involuntarily by the brain, like those attached to the base of hair follicles or in the walls of the gastro-intestinal tract.